Skip to content
CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-43329

netfilter: flowtable: strictly check for maximum number of actions

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: strictly check for maximum number of actions The maximum number of flowtable hardware offload actions in IPv6 is: * ethernet mangling (4 payload actions, 2 for each ethernet address) * SNAT (4 payload actions) * DNAT (4 payload actions) * Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing) for QinQ. * Redirect (1 action) Which makes 17, while the maximum is 16. But act_ct supports for tunnels actions too. Note that payload action operates at 32-bit word level, so mangling an IPv6 address takes 4 payload actions. Update flow_action_entry_next() calls to check for the maximum number of supported actions. While at it, rise the maximum number of actions per flow from 16 to 24 so this works fine with IPv6 setups.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • c29f74e0df7a02b8303bcdce93a7c0132d62577a to < ead66c77303f760f6c30be96e2e20d5a77cef614affected
  • c29f74e0df7a02b8303bcdce93a7c0132d62577a to < fe9018d3e94329f1951b00805a8640bc06f56eadaffected
  • c29f74e0df7a02b8303bcdce93a7c0132d62577a to < 5382bb03e9c33b089d60788478b922a2dca284ccaffected
  • c29f74e0df7a02b8303bcdce93a7c0132d62577a to < 57c78bd2e2dd08897acd35b2bf8bcef322e36f5eaffected
  • c29f74e0df7a02b8303bcdce93a7c0132d62577a to < 504c9456699dcf4d15195ef34a0fa94a80bfc877affected
  • c29f74e0df7a02b8303bcdce93a7c0132d62577a to < 879959a7a2be814dd57568655eafa3d8f4d0309eaffected
  • c29f74e0df7a02b8303bcdce93a7c0132d62577a to < 76522fcdbc3a02b568f5d957f7e66fc194abb893affected

Linux Linux

Default version status: affected

  • 5.5affected
  • 0 to < 5.5unaffected
  • 5.15.203 to ≤ 5.15.*unaffected
  • 6.1.168 to ≤ 6.1.*unaffected
  • 6.6.134 to ≤ 6.6.*unaffected
  • 6.12.81 to ≤ 6.12.*unaffected
  • 6.18.22 to ≤ 6.18.*unaffected
  • 6.19.12 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References